Hatchet fish swimming straight up and down

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nerdelish

Aquarium Advice Freak
Joined
Jun 16, 2015
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229
Location
North Carolina
Just noticed one of my hatchet fish swimming straight up and down. Any idea what is wrong? Hatchet fish have been in my tank for at least 4 months. Tank has been cycled for at least 6 months.

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Did you ever figure out what was wrong? I have two doing the same thing.
 
My fish do that sometimes too. They do that if it's mirrored on the inside (sides of most tanks are) or if they can see their reflection in the glass.
 
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